Andy,
In times past you could order a suitable crystal from International Crystals in Oklahoma.
Unfortunately, due to the proliferation of frequency synthesizers, they are no longer in business.
There was another provider of custom crystals in Ft Myers Florida but they are out of business
for the same reason. I have ordered custom crystals from both of these manufacturers several
times.
Another way to generate the exact frequency, for experiential purposes, is you could purchase
one of several relatively cheap units to generate the desired frequency.
Circuit boards using the ASF4351 synthesizer chip are available on E-Bay for about $40.00.
Unfortunately, these require an external programmer to set up.
A complete unit with programmer included is about $150.00.
Hopefully, this will be a good starting point for you.
-----Original Message-----
From: JoAnne Maenpaa <joanne.k9jkm@gmail.com>
To: amsat-bb@amsat.org
Sent: Sun, Nov 6, 2022 3:28 pm
Subject: [AMSAT-BB] Re: Crystals for 2m
Quite a few crystal oscillators in a receiver are running on the
third-harmonic of the crystal's fundamental frequency. The local
oscillator in consumer scanning receivers was calculated with this
formula:
- Receive frequency - 10.7 MHz / 3 = crystal
frequency
The formula generated a local oscillator frequency that was the
first IF frequency (10.7 MHz) after the mixer stage.
On 11/6/2022 12:33 PM, Andy Brian
wrote:
Hi,
I'm looking for good source of crystals between 156.5 and
156.600MHz for build experimental
linear transponder. Please for any got information or some
other solutions.
I received a few from marine scanners but it seems not
156Mhz
--
73 de JoAnne K9JKM
joanne.k9jkm@gmail.com
BM DMR TG 98006
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